Less severe ACL injuries can recover in about 3~4 weeks after conservative treatment, and more severe injuries can recover in about 6~8 weeks after surgical treatment. 1. If the ACL injury is mild, meaning that the ligament is not completely ruptured and the joint is still stable. After conservative treatment, it can be recovered in 2~3 weeks. The main treatment is to wear a brace to immobilize for 3~4 weeks, and you can take symptomatic oral painkillers such as celecoxib and loxoprofen sodium. The use of drugs should be under the guidance of a doctor. 2. If the ACL injury is more serious and daily life is seriously affected, surgery is needed. Surgery is mainly ligament repair, mainly arthroscopic minimally invasive way. After surgery, immobilization is still required for 6-8 weeks. When ACL injury occurs, it is recommended that patients go to regular hospitals for timely treatment.